CONSTANTS not passed to Template

[assistcontrol]

It seems like CONSTANTS aren't being passed to the Template engine.

$app->plugin('tt_renderer' => {
    template_options => {
        CONSTANTS => { foo => 123 }
    }
}

template:
Foo is [% constants.foo %]


Expected: Foo is 123
Actual: Foo is

Is there something that I'm missing about passing in CONSTANTS?

[plicease]

Interesting. It appears to have to do with the use of a customized Template::Provider subclass that is used by TtRenderer. I can reproduce the behavior with a simple script thusly:

use strict;
use warnings;
use Template;

my %config = (
  CONSTANTS => { foo => 123 },
);

$config{LOAD_TEMPLATES} = [ Template::Provider->new(%config) ];

my $tt = Template->new(\%config);

$tt->process(\"Foo is [% constants.foo %]\n");

when I run this I get:

helix% perl foo.pl 
Foo is 

if you look at the source code for TtRenderer you will see that it uses a Template::Provider subclass to handle some of the magic of finding templates in __DATA__ sections etc.

https://metacpan.org/source/PLICEASE/Mojolicious-Plugin-TtRenderer-1.60/lib/Mojolicious/Plugin/TtRenderer/Engine.pm#L66-68

Unfortunately the plugin does not work without the the Template::Provider subclass. I think this is a Template Toolkit issue, but I am happy to accept a patch which fixes it here if the problem is in TtRenderer.